Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3006 - Cabooses (Railroads)
- 10 more...
- ItemTRWahl0912 - Great Northern Caboose X632, Bellingham, Washington, undated
- ItemTRWahl0913 - Great Northern Caboose X632, Bellingham, Washington, undated
- ItemTRWahl0916 - Great Northern Caboose X244, Bellingham, Washington, undated
- ItemTRWahl0921 - Great Northern Caboose X224, Bellingham, Washington, undated
- ItemTRWahl0942 - Great Northern Caboose X699, Bellingham, Washington, undated
- ItemTRWahl1029 - Great Northern Caboose X629, Bellingham, Washington, undated